considered diffraction

Finally read the Fraunhofer diffraction primer forum document that I had received from Kevin back in January 2014. Shortly after my focusing mask presentation. The diffraction PDF document is available from the Braye Brook Observatory web site.

Chris Lord, from the UK, advocated Y masks... partly for energy transmission. The avid double star observer also showed that a diffraction mask can be off axis from the telescope's entrance pupil.

Lots of ideas! It might be easier to build a Y-mask off centre. It definitely would be easier to build a Y-mask with 3 full wires crossing the aperture. A three-wire solution would be scalable...